FN Archimer Export Format
PT J
TI Water diffusivity in PA66: Experimental characterization and modeling based on free volume theory
BT 
AF BROUDIN, M.
   LE GAC, Pierre-Yves
   LE SAUX, V.
   CHAMPY, C.
   ROBERT, G.
   CHARRIER, P.
   MARCO, Y.
AS 1:1;2:2;3:3;4:1;5:4;6:1;7:3;
FF 1:;2:PDG-REM-RDT-LCSM;3:;4:;5:;6:;7:;
C1 ZI Nantes Carquefou, TrelleborgVibracoust, F-44474 Carquefou, France.
   IFREMER, Marine Struct Lab, Ctr Brest, F-29280 Plouzane, France.
   Univ Brest, ENSTA Bretagne, ENIB, Lab Brestois Mecan & Syst,EA 4325, F-29806 Brest 9, France.
   Technyl Innovat Ctr Simulat & Validat Applicat, Solvay Engn Plast, F-69192 St Fons, France.
C2 TRELLEBORG VIBRACOUST, FRANCE
   IFREMER, FRANCE
   UBO, FRANCE
   TECHNYL INNOVAT CTR SIMULAT & VALIDAT APPLICAT, FRANCE
SI BREST
SE PDG-REM-RDT-LCSM
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 3.485
TC 43
UR https://archimer.ifremer.fr/doc/00260/37148/35794.pdf
LA English
DT Article
DE ;Water absorption;Free volume;Polyamide;Modeling
AB Diffusion of water in polyamide 6.6 has been characterized for a wide range of temperatures (from 25 to 80 °C) and various humidities using dynamic vapor sorption machine. The decrease in glass transition temperature (Tg) has also been measured using DMA tests. As usually observed, PA66 absorbs a large amount of water (up to 5% at 90%RH) with a Fickian behavior with a diffusion coefficient that depends on water activity for all temperatures. Moreover, it appears that the diffusion coefficient for tests performed below Tg is almost independent of the water activity whereas a strong dependency is observed above Tg. This behavior is to be compared to a large decrease of Tg with the absorption of water. The increase of the water diffusion can therefore be related to a change of the amorphous phase (the crystalline phase is supposed to absorb no water) from the glassy to the rubbery states. A model based on the free volume theory is used successfully to describe the wide experimental database. It is therefore possible to describe the dependency of the water diffusion kinetics on both temperature and water uptake using the approach described in this paper.
PY 2015
PD JUL
SO European Polymer Journal
SN 0014-3057
PU Pergamon-elsevier Science Ltd
VL 67
UT 000357750900031
BP 326
EP 334
DI 10.1016/j.eurpolymj.2015.04.015
ID 37148
ER

EF